(19)
(11) EP 0 381 449 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.10.1991 Bulletin 1991/42

(43) Date of publication A2:
08.08.1990 Bulletin 1990/32

(21) Application number: 90300957.9

(22) Date of filing: 30.01.1990
(51) International Patent Classification (IPC)5: G02B 27/00, G02B 23/12, G02B 23/10
(84) Designated Contracting States:
DE FR GB IT SE

(30) Priority: 01.02.1989 US 305000

(71) Applicant: SYSTEMS RESEARCH LABORATORIES, INC.
Dayton, Ohio 45440-3696 (US)

(72) Inventors:
  • Riddell, James III
    Bellbrook, Ohio 45305 (US)
  • Lambertson, David C.
    Dayton, Ohio 45432 (US)

(74) Representative: Warren, Anthony Robert et al
BARON & WARREN, 18 South End, Kensington
London W8 5BU
London W8 5BU (GB)


(56) References cited: : 
   
       


    (54) Heads up display for night vision goggle


    (57) Conventional night vision goggles are, according to the invention, provided with heads up display information at the same focus and in the same field of view as the intensified image. The heads up display information is typically generated by a remotely located cathode ray tube and transferred to the goggles (10) by a fiber optic cable (35). This information is intro­duced from a beam expander or taper (37) into one of the eyepieces (20), which eyepiece is modified to include an image combiner (45) placed inside its outer lens (52) in order to provide substantially the same eye relief and physical dimensions as an unmodified eyepiece. The image combiner includes a partially reflective mirror (46). Additional lenses (41, 42, 43) are provided between the heads up display from the beam expander (37), and the beam combiner (45), to ensure that this additional information is presented to the eye at the same focus as the intensified image.







    Search report